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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1ef8d513e6be699d37f599b1e69e0e6c2886eb81f486d6587fefa96a49d6c4' 
  AND token = '0jtOrLo2S1ezf3zFVgjUd3t7pIu+reTYi/6h7jlWoUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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