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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8cd9265a16838753c30c28d3077590f74897f6c4bc89d676b90182b8330789' 
  AND token = 'ti2haSRl66/gPZucppIGaWb31BrhMiElqQ4luCEbDtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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