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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d3f95b67fa925f9a7a685791fb7e8db06e51eeae86e21358c366eef38f2ac8' 
  AND token = '/Fl6tBelZgwHeyosmmGpUy3SCDvJmmi20ssPk7daLeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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