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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a7aafe66c0e9b9293e38ca9d6ea1a20d36751b80328bf3c2cd71fc7e1b9a20' 
  AND token = 'TZlrVpzBf0L0INP6FyzTsQ1iUTYFfmoBBTY8lqRg5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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