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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdb1d61186d9d1eb844f920f1598b7368182204d5d8301b48aae5f28406b29e' 
  AND token = 'TBkMJJYOgjhLPoH4974aGnArce6dEzm6DRX+z3ckAEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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