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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ca9cc07e3efb9c6f7883ce35321260ad7d61b5da143e0aa7fafb6197acacd' 
  AND token = 'Ot/INmV2RrlIcic/jFh9g89dSJfv98vr95FQ2Wlha98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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