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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5836e3eb1694c95b511a848e4f63b0a91607e5947c90c9bd208873349c2826d0' 
  AND token = 'V0nfD4twmAUYQfA0RvtFOY882Ugv5BwXehxrybcsu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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