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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a30aa0d71232331c4c610c9de65a77ac8d3b8549fcd95fd690fb7b3c8d09f9' 
  AND token = 'nrfwosj2GOVMEyT4EotI60RpKpMYKSUhyP3hNuisSfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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