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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f37fa22c3c9a0cde5c997a7a470866f7e9aad77986302115d8fe711b8c401b' 
  AND token = 'jm/iGW1jZrSXi6ry3ERL5JlThZVM71vLywBcrcQT8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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