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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3509fc31d9759000b921d55c282ed2113fac2b869af0f306242ebfeb87f87d' 
  AND token = '+itSiC9yzqrn3PBBntT4ZyuCzebDqdb5UWYBv5vRRHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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