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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096dea0eb9549cc6d80f43b93a5cbc6d3c517f26bae43d26eb25fd9063362cad' 
  AND token = 'alTPmcxzQGxe6lOLSEJ1NRtOAUdoYw/XfcOzOsM86nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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