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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc7bfddd4c1f528e5ab6270c4b8141cdd7e3208ac0a4e51418a6e25bd8aa6fd' 
  AND token = 'V1gwOlXEv0laDvRl57/SvoYOaZXqcAw87AKW9THQmf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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