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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49eb67215c8739e163bdefb7675fce526a19cb75c911b04a9eb50beb2f286c55' 
  AND token = 'vxjpSp/xMxawEpFcpVB+vcuGNRPBS4b+LavZE/kiO2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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