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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4d9f4bc9bc97e8a91d4ad57cfa3f4205bafb2fbc40fe785cbb740210185c2a' 
  AND token = 'WaCS/9ZbcWaI9qSTvVCAX2heSbnK57M/xNVX7D3r87A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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