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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a583d627cc968e19a1bf5b9cdabf598855aa53752ad7ebe3f60db81c46809b2' 
  AND token = 'BKuBCWq//fDf3nFkmvVFGv8Du4fudkFk06FL7xoJ1H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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