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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda72b4ebc9d3cb4c4eb194c7f55871bc1e4cc4ba341eff400a1870da1c5b9c0' 
  AND token = 'lYAaWHJBtloOkl6feWoql3bgYEW2A4xeE25ufauLb+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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