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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28a2fcdc78f02f0593992977ff2fd122ea1e2725513e54ec81a8c05d2a9b2bc' 
  AND token = 'L7JOCl2oZJDYP9rQzExyWGxxwWlpZxm5B+SazPno9BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}