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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6b1be00755ff583f1eabe8f37ca9830733faaa90de097e0f4a38eb7c69839e' 
  AND token = '8SiR5wWDZWlAE5aN2u2ZXTr1pdLtsazPYoTD87odSEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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