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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fead9a657646971e068604e4fb068767389e7f0f84191bc9dfe8e427a175d7ab' 
  AND token = 'p/pG3S7euoUOk/Adax2AS7pQAXf6ZBg0qlZ05EMPPJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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