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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bf9c3912feec985f16abcc5d816f14b9217d9287b8c82696a53b4735b2713a' 
  AND token = 'N3YnIwDMJXebsAo6hpsTwZCefze6B+oOg0cckqMlepg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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