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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee9eefa1ab468d1093cb47d4807610aa12c72dc5ae9fbb5ee77e19ce72e32c2' 
  AND token = 'papeP0xbdc4SlO5Q2xaQS8zQ/oXlWk1Yn21UdWmWjc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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