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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e111625fb6f1e027e5b6a020f53619144f38ce3ffa7d85653357796f59309d9' 
  AND token = 'rNtfyZM9Dj4bBtauw7pj+pgbr37qWMGBiX6NBf3tsAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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