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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96ee10907730154f700b13679919fc491aae524bd89b2cd8bd7ed86f0c8d2cd' 
  AND token = 't0k7diF8EN+dxWYjogFOuZMlBaVJauIuer7mpt38SEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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