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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8c60a5b7e3c5bb11331abecf5f8330dc75e9090e5a64e2491ababce50ae4c2' 
  AND token = 'eAds3J2pV5F2AzJSltiWAYwUYF3tOzvxFyHjlsmy99I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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