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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caf5e741f9cfacf0f4f66ecd6006536f7d76319cbbdf2c87e0772143b31ecf5' 
  AND token = 'Hp77d5dqv1Rpw21mt1TqvyObWqhAi/+c0ErE8ncorMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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