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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee7335b28ef1ed089c70eb60edafd17a5e20927910e6ae1ba5e32228b8e6bab' 
  AND token = 'Pq0fhsO3j1PvjBAOeTpQIirXwJfHJg8fAu4JkSxgQns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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