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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb016111fadcf1f06bd8ab171a71ee65259bbb0d4714305fe544476cb72119d9' 
  AND token = 'puAQUu4uP4VYGbeIfmABW7PAaCj7qTIswl+HwMZkSs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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