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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3cc697ce0cf7dae5c18838e1a8d5be4061fc33c3ff6884ca156c4662f73eb5' 
  AND token = 'bzzwyk3t1XUfH9Pf6/25DhUOB9WHk6ashJyFvcSwkKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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