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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f67e397c1d295e19cfdd3f7e32eda523241b542eff91587952758f6b25851ce' 
  AND token = '373IgKrL2j90dCuir6kyWI/lj46f+AS9m5gXlA3vWyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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