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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07521cc53579cda3a967a768b072c075212747316effa31a4bf1fff9312c433' 
  AND token = 'b32Tj39CtEWbD3brtCesk2Ce3iB2BRSPA36GeMjB+vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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