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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d5cc5d07787fb3f932989d02ee88e95b32879e6e6336adf289bd905c42e02a' 
  AND token = '2PlXNj5ggN8eeyP/6udLt+gEFfKi6+2auWmY9m/+TBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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