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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c682d98eee26db1319e3a3e51d3ed996d4d323aa6e1e8c39afc1ee5047930089' 
  AND token = 'qCU+AvR6GjUdAd6gHypnJOV9y/svK5SXs+lW9e55ykE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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