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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbba14f71068954a13a6140ddcaed8524885fc7a29ce427cc7859c2df8f0064' 
  AND token = '7XpW5p7dApdMDtdgDd3I4fydZJTPhcgkTxPcbLrUofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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