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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91fda8506e81dc8fe8d7d8a19a7f1ac6c48d67660cf071d82b51d3a63cff9c7' 
  AND token = 'iKbip26PIF/3ASgDeWT1ayFfz2OTBLvPqYyJi8SZSWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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