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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93aa2fcb3a4d8dcaf71b10285adb01a16a3e2e577766ae96eb8db195941e4975' 
  AND token = 'knVx1zZIl4EGQ2DezNX16bLsrqRxqQEKidhIxf04Lv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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