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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3ff17cb3ed54e6415494e1f73f92c960109e4008d98aa33a1842ab311a1b82' 
  AND token = 'y98H9Cn1HWNk2B9saqrx0Al8ZkpUOUmDXhAN8+gKsWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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