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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e02f4a0accfe07b1b040daf861ce81f7cafa9ec66b339e39f5244ca64ef8253' 
  AND token = '2PZQZW/SiksmNYHi9iPE7QF5bqwtK4ybUhCFEyCjJGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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