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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56ba3b56e6df2d9d9a95cba50c5cfb8e22c29c4bcaf6e8f64169d3e09c56ba9' 
  AND token = 'pK2+hY/O6HLbmw95riaI/T9meaM4mYrmeTdx7Unu3ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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