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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1bcad6fc0df71c70d3194508b65d91b6932cce13c02183df31a72627985d32' 
  AND token = 'tmWhSHFf6PLbY2xv/atPZm4Rd1q6mYTKmyRte/WTNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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