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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f350ac3275ba0f8ba4b16afc0589c7089782945a7d561c3871c73ffbb2b3695' 
  AND token = '8JRGFIxdDyeNVeLpfH1rqOdg2+ljS2SNZaxmdll6sd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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