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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd462d4fe088b5e83225ab2670d6c7a160a47601c75f55cc557d459220e346e76' 
  AND token = 'Z0UafeIr8/5skVPaonWPbCrMOwYqiJp3ameUJyCSczA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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