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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926dd361dcc47230feb2199b8b0b11c6bda9a2461d8bab08a092caf4df6dfb8d' 
  AND token = '03gYwIjV1cDc4utp0LQZAVJsRYAy/qkbUH9dMeD3Xfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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