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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad70fb129d2d7fd54f1c60515293f6ffb5e709f50383ed174ae1837b3ef548a4' 
  AND token = 'Np/uzzMjAhCCUa8ZN7mJEOauwtawnU1pBa8YEgyw1PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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