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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dff3a3f2aa93a4e4c2257e853cc860f428859e94adc1d67493e2713af4163a' 
  AND token = 'Po+5VXtUfEvktunOef4Hj/S0glPuP0St0dCjX5maGtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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