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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038e6ec5e3bc35614d6fd82dc06939e189cec6500f3cf59d400156e8a82485bf' 
  AND token = 'Cp2BbUOFKfOmjusYdif0k6gFdy/LTPjQkReGzJjhp30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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