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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd529bad0a6563b53709cb97d8e1d6e4ce79ee797ff579ce1124d9d9c90aa9402' 
  AND token = 'AIIXzjdrBovAy5qhbbPshhTDzF9huW04VN65VpmmCAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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