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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdde02c7ef8af031381aeca21e7e9500a2f3970364e74996a53653252e3f163b' 
  AND token = 'FltqGFdOSKds5JwSjVOJ1UZQ0F2Q1XVfiDfNDeHGb0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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