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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858f84d2eab19e20a0f2f3992e71f6877facc2d48d51a7e838a4a9fcda2194d6' 
  AND token = '7D+AxlChGneTuMT3Hkc8UbNsa+I2NJBtg9i8OgbN/QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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