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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7a83cbcd4a29808b536fc6b898240de3741390c69847be7d5e87130e14ac19' 
  AND token = '/niqKGB6o3dxpLV27Y4g8LK38p0lqSIXsGAlAOxpSDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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