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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71d456f3cc06234d4ec6e2db473b63eadac9b828296c0e41bf27df90894efcf' 
  AND token = 'Znxmg1SdF8QLEMUDbHWD0aJixLogRVq6ecDq8wpnsSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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