SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e64e9db2cfe74a5863c32f38f9b8b6ab5f18543ceab39b569ad276294cd7553' 
  AND token = 'DYGPKZBveYWYlGiJG8a4/1fmW2aKSLSUdXPl+Tsucd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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