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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1792acfc28379550394eb15d06c6f80ad2c600d926bbdcc019014eb36f4975b7' 
  AND token = '0T36sFBj29Ykro2KarnzbUHgSxlT9HJdzhSPrSxYU6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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