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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7bef9e0dae1b7c0bef6982aabf0784be415c64420bf7ad4e31e03586ddd0a' 
  AND token = 'rjvg3+X971ngX8MSZ/paTp7s7tXzQWErv6AsNWyvzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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