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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb15c255422384e9378617fc31015b48157fafd21643a9d596e25decd5817d4' 
  AND token = 'tqYJ2X5u1LfEAEkcM1UQKSxFOEyBZIR75N6kmESNy/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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