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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecc2e5bb29b5c5ff16a3af2f5c2474703722bfd3ab4a287485e9c210a414489' 
  AND token = 'pmuLKiFa5DEj9JfIDJ50o0GaJJA84dku4lfZVTQXRuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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