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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2490615afd4a05e430c32b6adb96ea8193e2857cb572bad5164608554f4cf5' 
  AND token = 'EbqeNzBktSEdZt02nH6YpXkeQKvKsRIeRdLsWc0QH+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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