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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ec691c29fd81a595708d6a342c6798b4516e16d084572b717b8175a3b78bd2' 
  AND token = 'pA33Sd4yw4ZVJvAoAeTUo7+XZ9PbAVB0AKKix9tvf88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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