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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ef8e68f7124c00a35bf28adecefa074300fe5b9ff083d70af78f7ed6a03c4b' 
  AND token = 'N/FbGZFycpld03W5B+CqZC/MvR9US9bNRw3yhxuEoIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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