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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73e7d17e6ef2f572d1f572f5857150c809339cdbc2599a7cd21f00bd5d86984' 
  AND token = 'UhYCny4PK94vx5oKeF480+TaUtef/0HNp70auIRZAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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