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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8b4ec70f47e4b9758157568ce76ad2726e6c056d86b4e1c91616d6d94c55f1' 
  AND token = '1oA5uwjirbyFqH+uXYbC/rFcTXxd7lzZlz5YbUXN8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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