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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9201633c11b55d67700e66619d2629d408c3894c5e103ff54cad30752a6d501d' 
  AND token = 'jEcrkbLDp1spXfZBPxCOT/ML7ML/uML/fWVK0jQfaoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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