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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc60a14a56d3d7e3aa273103179f02e2d76daf9399004344025f900a4b073e4' 
  AND token = 'yiA/qdRxxd/cbkxP6Lvr1v0xKzliEgS4sHf4Ez382uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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