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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673a477fed04decc29331c16fd2daf168c222e68ecb300546a353ba2168921a3' 
  AND token = '8VMDU7j5Ew8jACidPksW8j61o7UjsJTPd4mvV8cBeOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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