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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd12ba5f3a95e7de92cebe531dc507aff69bafc49d30067c40d970e4a2acc35' 
  AND token = 'KVjNMs2V2ncr5dQEXhqn5p5o3OCNj4rv7VudFlJFRTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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