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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bdfcfc55b02ca449019135287d4d51224dc0c95e03eabc7f730aef61a7f9c4' 
  AND token = '1HnDhR+2kiRPD/oDPvwnx6pcblPkcDVOs19+kd0/qfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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